/** @file
  Ihis library uses TPM2 device to calculation hash.

Copyright (c) 2013 - 2015, Intel Corporation. All rights reserved. <BR>
(C) Copyright 2015 Hewlett Packard Enterprise Development LP<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include <PiPei.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/Tpm2CommandLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/HashLib.h>
#include <Library/PcdLib.h>

typedef struct {
  TPM_ALG_ID AlgoId;
  UINT32     Mask;
} TPM2_HASH_MASK;

TPM2_HASH_MASK mTpm2HashMask[] = {
  {TPM_ALG_SHA1,         HASH_ALG_SHA1},
  {TPM_ALG_SHA256,       HASH_ALG_SHA256},
  {TPM_ALG_SHA384,       HASH_ALG_SHA384},
  {TPM_ALG_SHA512,       HASH_ALG_SHA512},
};

/**
  The function get algorith from hash mask info.

  @return Hash algorithm
**/
TPM_ALG_ID
Tpm2GetAlgoFromHashMask (
  VOID
  )
{
  UINT32 HashMask;
  UINTN  Index;

  HashMask = PcdGet32 (PcdTpm2HashMask);
  for (Index = 0; Index < sizeof(mTpm2HashMask)/sizeof(mTpm2HashMask[0]); Index++) {
    if (mTpm2HashMask[Index].Mask == HashMask) {
      return mTpm2HashMask[Index].AlgoId;
    }
  }

  return TPM_ALG_NULL;
}

/**
  Start hash sequence.

  @param HashHandle Hash handle.

  @retval EFI_SUCCESS          Hash sequence start and HandleHandle returned.
  @retval EFI_OUT_OF_RESOURCES No enough resource to start hash.
**/
EFI_STATUS
EFIAPI
HashStart (
  OUT HASH_HANDLE    *HashHandle
  )
{
  TPMI_DH_OBJECT        SequenceHandle;
  EFI_STATUS            Status;
  TPM_ALG_ID            AlgoId;

  AlgoId = Tpm2GetAlgoFromHashMask ();

  Status = Tpm2HashSequenceStart (AlgoId, &SequenceHandle);
  if (!EFI_ERROR (Status)) {
    *HashHandle = (HASH_HANDLE)SequenceHandle;
  }
  return Status;
}

/**
  Update hash sequence data.

  @param HashHandle    Hash handle.
  @param DataToHash    Data to be hashed.
  @param DataToHashLen Data size.

  @retval EFI_SUCCESS     Hash sequence updated.
**/
EFI_STATUS
EFIAPI
HashUpdate (
  IN HASH_HANDLE    HashHandle,
  IN VOID           *DataToHash,
  IN UINTN          DataToHashLen
  )
{
  UINT8            *Buffer;
  UINT64           HashLen;
  TPM2B_MAX_BUFFER HashBuffer;
  EFI_STATUS       Status;

  Buffer = (UINT8 *)(UINTN)DataToHash;
  for (HashLen = DataToHashLen; HashLen > sizeof(HashBuffer.buffer); HashLen -= sizeof(HashBuffer.buffer)) {

    HashBuffer.size = sizeof(HashBuffer.buffer);
    CopyMem(HashBuffer.buffer, Buffer, sizeof(HashBuffer.buffer));
    Buffer += sizeof(HashBuffer.buffer);

    Status = Tpm2SequenceUpdate((TPMI_DH_OBJECT)HashHandle, &HashBuffer);
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
  }

  //
  // Last one
  //
  HashBuffer.size = (UINT16)HashLen;
  CopyMem(HashBuffer.buffer, Buffer, (UINTN)HashLen);
  Status = Tpm2SequenceUpdate((TPMI_DH_OBJECT)HashHandle, &HashBuffer);
  if (EFI_ERROR(Status)) {
    return EFI_DEVICE_ERROR;
  }

  return EFI_SUCCESS;
}

/**
  Hash sequence complete and extend to PCR.

  @param HashHandle    Hash handle.
  @param PcrIndex      PCR to be extended.
  @param DataToHash    Data to be hashed.
  @param DataToHashLen Data size.
  @param DigestList    Digest list.

  @retval EFI_SUCCESS     Hash sequence complete and DigestList is returned.
**/
EFI_STATUS
EFIAPI
HashCompleteAndExtend (
  IN HASH_HANDLE         HashHandle,
  IN TPMI_DH_PCR         PcrIndex,
  IN VOID                *DataToHash,
  IN UINTN               DataToHashLen,
  OUT TPML_DIGEST_VALUES *DigestList
  )
{
  UINT8            *Buffer;
  UINT64           HashLen;
  TPM2B_MAX_BUFFER HashBuffer;
  EFI_STATUS       Status;
  TPM_ALG_ID       AlgoId;
  TPM2B_DIGEST     Result;

  AlgoId = Tpm2GetAlgoFromHashMask ();

  Buffer = (UINT8 *)(UINTN)DataToHash;
  for (HashLen = DataToHashLen; HashLen > sizeof(HashBuffer.buffer); HashLen -= sizeof(HashBuffer.buffer)) {

    HashBuffer.size = sizeof(HashBuffer.buffer);
    CopyMem(HashBuffer.buffer, Buffer, sizeof(HashBuffer.buffer));
    Buffer += sizeof(HashBuffer.buffer);

    Status = Tpm2SequenceUpdate((TPMI_DH_OBJECT)HashHandle, &HashBuffer);
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
  }

  //
  // Last one
  //
  HashBuffer.size = (UINT16)HashLen;
  CopyMem(HashBuffer.buffer, Buffer, (UINTN)HashLen);

  ZeroMem(DigestList, sizeof(*DigestList));
  DigestList->count = HASH_COUNT;

  if (AlgoId == TPM_ALG_NULL) {
    Status = Tpm2EventSequenceComplete (
               PcrIndex,
               (TPMI_DH_OBJECT)HashHandle,
               &HashBuffer,
               DigestList
               );
  } else {
    Status = Tpm2SequenceComplete (
               (TPMI_DH_OBJECT)HashHandle,
               &HashBuffer,
               &Result
               );
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }

    DigestList->count = 1;
    DigestList->digests[0].hashAlg = AlgoId;
    CopyMem (&DigestList->digests[0].digest, Result.buffer, Result.size);
    Status = Tpm2PcrExtend (
               PcrIndex,
               DigestList
               );
  }
  if (EFI_ERROR(Status)) {
    return EFI_DEVICE_ERROR;
  }
  return EFI_SUCCESS;
}

/**
  Hash data and extend to PCR.

  @param PcrIndex      PCR to be extended.
  @param DataToHash    Data to be hashed.
  @param DataToHashLen Data size.
  @param DigestList    Digest list.

  @retval EFI_SUCCESS     Hash data and DigestList is returned.
**/
EFI_STATUS
EFIAPI
HashAndExtend (
  IN TPMI_DH_PCR                    PcrIndex,
  IN VOID                           *DataToHash,
  IN UINTN                          DataToHashLen,
  OUT TPML_DIGEST_VALUES            *DigestList
  )
{
  EFI_STATUS         Status;
  UINT8              *Buffer;
  UINT64             HashLen;
  TPMI_DH_OBJECT     SequenceHandle;
  TPM2B_MAX_BUFFER   HashBuffer;
  TPM_ALG_ID         AlgoId;
  TPM2B_EVENT        EventData;
  TPM2B_DIGEST       Result;

  DEBUG((EFI_D_VERBOSE, "\n HashAndExtend Entry \n"));

  SequenceHandle = 0xFFFFFFFF; // Know bad value

  AlgoId = Tpm2GetAlgoFromHashMask ();

  if ((AlgoId == TPM_ALG_NULL) && (DataToHashLen <= sizeof(EventData.buffer))) {
    EventData.size = (UINT16)DataToHashLen;
    CopyMem (EventData.buffer, DataToHash, DataToHashLen);
    Status = Tpm2PcrEvent (PcrIndex, &EventData, DigestList);
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
    return EFI_SUCCESS;
  }

  Status = Tpm2HashSequenceStart(AlgoId, &SequenceHandle);
  if (EFI_ERROR(Status)) {
    return EFI_DEVICE_ERROR;
  }
  DEBUG((EFI_D_VERBOSE, "\n Tpm2HashSequenceStart Success \n"));

  Buffer = (UINT8 *)(UINTN)DataToHash;
  for (HashLen = DataToHashLen; HashLen > sizeof(HashBuffer.buffer); HashLen -= sizeof(HashBuffer.buffer)) {

    HashBuffer.size = sizeof(HashBuffer.buffer);
    CopyMem(HashBuffer.buffer, Buffer, sizeof(HashBuffer.buffer));
    Buffer += sizeof(HashBuffer.buffer);

    Status = Tpm2SequenceUpdate(SequenceHandle, &HashBuffer);
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
  }
  DEBUG((EFI_D_VERBOSE, "\n Tpm2SequenceUpdate Success \n"));

  HashBuffer.size = (UINT16)HashLen;
  CopyMem(HashBuffer.buffer, Buffer, (UINTN)HashLen);

  ZeroMem(DigestList, sizeof(*DigestList));
  DigestList->count = HASH_COUNT;

  if (AlgoId == TPM_ALG_NULL) {
    Status = Tpm2EventSequenceComplete (
               PcrIndex,
               SequenceHandle,
               &HashBuffer,
               DigestList
               );
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
    DEBUG((EFI_D_VERBOSE, "\n Tpm2EventSequenceComplete Success \n"));
  } else {
    Status = Tpm2SequenceComplete (
               SequenceHandle,
               &HashBuffer,
               &Result
               );
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
    DEBUG((EFI_D_VERBOSE, "\n Tpm2SequenceComplete Success \n"));

    DigestList->count = 1;
    DigestList->digests[0].hashAlg = AlgoId;
    CopyMem (&DigestList->digests[0].digest, Result.buffer, Result.size);
    Status = Tpm2PcrExtend (
               PcrIndex,
               DigestList
               );
    if (EFI_ERROR(Status)) {
      return EFI_DEVICE_ERROR;
    }
    DEBUG((EFI_D_VERBOSE, "\n Tpm2PcrExtend Success \n"));
  }

  return EFI_SUCCESS;
}

/**
  This service register Hash.

  @param HashInterface  Hash interface

  @retval EFI_SUCCESS          This hash interface is registered successfully.
  @retval EFI_UNSUPPORTED      System does not support register this interface.
  @retval EFI_ALREADY_STARTED  System already register this interface.
**/
EFI_STATUS
EFIAPI
RegisterHashInterfaceLib (
  IN HASH_INTERFACE   *HashInterface
  )
{
  return EFI_UNSUPPORTED;
}